Chase Kriedeman, MacKenzie Skartveit, Cassidi Perkins

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Presentation transcript:

Chase Kriedeman, MacKenzie Skartveit, Cassidi Perkins Mollusca Chase Kriedeman, MacKenzie Skartveit, Cassidi Perkins

There are over 85,000 Mollusca are recognized. General Description They are largely known for being highly diverse invertebrates, not only in size but the habitats they choose as well. There are over 85,000 Mollusca are recognized. Mollusca have similar organisms such as snails, octopuses, squids Camouflage- helps them hide This Photo by Unknown author is licensed under CC BY-SA.

Symmetry Bilateral- cuts right in half

Radula- anatomical structure used for feeding Herbivores Omnivores Carnivores Radula- anatomical structure used for feeding This Photo by Unknown author is licensed under CC BY-SA.

Circulation mollusks have an open circulatory system, which means that their blood is not restricted to blood vessels and flow around the body. They have a three chambered heart, two atria and one ventricle. Mantle- wall that covers the visceral mass

Nephridia- acts as an organ for excretion Releases ammonia in blood Nephridia releases outside the body Gills- enters and leaves in the same spot This Photo by Unknown author is licensed under CC BY.

Response In adaptation to a directed movement there was not only an evolution of eyes, but also a change in body The head evolved as the centre of sensory activity (cephalization). They have two pairs of main nerve cords: the visceral cords - the internal organs and the pedal ones serving the foot and the ganglia.

Movement Mollusca. The mollusks’ muscular system is primarily made up of the foot that allows for movement. They move by suctioning and burrowing down. Jet Propulsion- ejecting out jet fluid to move This Photo by Unknown author is licensed under CC BY-SA.

Reproduction They reproduce sexually via external fertilization where the eggs are shot into the water by the female and the male fertilizes them. This Photo by Unknown author is licensed under CC BY.

Respiration A Mollusk has tubes called siphons that bring water in and out of their bodies this happens so that they can get oxygen and give off carbon dioxide. They have gills that help with this.

Cephalopod- Octopi and Squid Classes of mollusca Cephalopod- Octopi and Squid Gastrpoda- Snails and Slugs Polyplacophora- Chitons This Photo by Unknown author is licensed under CC BY-SA-NC.